Required fields in SharePoint
In SharePoint you always have to consider the required fields when you update list items. However when you update or create a list item with the patch function you will find that required fields are simply marked as required in SharePoint however the Patch will still work.
So even though I didn’t fill in a required field in my Patch function. The SharePoint list item is still created. This is without enabling the error handling in Power Apps.
Formula-level error management
Notice that Formula-level error management is still one of the experimental features. However you can enable it quite easily within the settings of your app.
Patch with the Formula-level error management enabled
Once you have enabled Formula-level error management however you will find that the Patch fails and Power Apps complains that there is a required field.
This is one thing that you do need to be aware off when you try the Formula-level error management feature. With this feature enabled the SharePoint connector seems to be less forgiving of your mistakes.